【題目】Since the new speed limits ______，the number of accidents in the area has fallen strikingly．

A. were introduced

B. introduced

C. have been introduced

D. have introduced

【答案】A

【解析】自從新的速度限制被提出，這個區(qū)交通事故的數(shù)量下降了很多。Since +過去式，主句+現(xiàn)在完成時，為常用句型。故排除C、D． 而since 引導句子中缺少謂語，而speed limits與introduce之間為被動關系故選A

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